name the following : (a) A chordate animal having flame cells as excretory structures. (b) Cortical portions projecting between the medullary pyramids in the human kidney. (c) A loop of capillary running parallel to the hwenle's loop.

Consider the following statements A. Flame cells are excretory structures in flatworms B. Green glands are excretory organs in annelids C. Columns of Bertin are the conical projections of renal pelvis into medulla between the renal pyramids

The following is the illustration of the sequence of ovarian events (a - 1) in a human female. (a) Identify the figure that illustrates ovulation and mention the stage of oogenesis it represents. (b) Name the pituitary hormone that has caused the above mentioned event. (c) Explain the changes that occur in the uterus simultaneously in anticipation (d) Write the differences between 'c and 'h'. (e ) Draw a labelled sketch of the structure of a human ovum prior to fertilization.